Apparatus por barking wood



P.A.PAULSON.

APPARATUS FOR BARKING woon.

APPLICATION FILED DEC-15.1915- 1,1 94,872. Patented Aug. 15, 1916.

2 SHEETS-SHEET 1.

P. A. PAULSON.

APPARATUS FOR BARKING WOOD. APPLICATION FILED 056.15. |915.

l UNITED sTATEs PATENT onirica.'

PETER A. '.PAU'LSON, OF APPLETON, WISCONSIN, ASSIGNOR OF ONE-HALFTO KIM-BERJAY- CLARK COMPANY, A CORPORATION OF WISCONSIN.

lAPPARATUS FOR BARKING- WOOD.

Specication of Letters Patent.

@Patented Aug. 15, 1916.

Application led December 15, 1,915. Serial No. 67,021.

To all whom 'it may concern.:

Be it known that I, PETER A. PAULsoN,

a citizen of the United States, residing at remove the bark from hemlock, balsam, spruce or other woods and deliver the wood.

clean and free from bark and dirt, so that it will be fit for the manufacture of pulp to be used in the finest grades of paper.. These objects I attain by a mechanism which comprises a rotatable hollow chamber, inclined at a suitable angle, within which the .logs are rolled, 'so that by the resulting attrition the bark is removed from the logs without injury to the Wood, this revolving chamber, preferably consisting of a series of drums, having perforated or.slotted\sides through which the-bark may escape as fast as it is rubbed off the logs. y

The invention also comprises certain improvements in means for preventing the loosened bark from being moved from drum to drum; means for accelerating the removal of the bark and dirt through 'the slots by a strong spray of water; an adjustable discharge gate to control ,the conditions of bark-removal in accordanfce With the con- 'dition of the wood; features of construction of the drums themselves; and means for handling the loosened bark after its delivery from the device. l

The invention alsocomprises various features of construction and operation, which will be hereinafter described and claimed.

In the accompanying drawings,-Figure 1 is a side elevation of the device partly in section; Fig. 2 is a transverse vertical section taken on the'line 2-2 of Fig. 1; Fig.

3is an end elevation of the discharge end and the adjustable discharge gate; Fig. 4 is a sectional elevation, on plane 4 4 of Fig. 5, showing the manner of securing the channel-bars to the ring 3; Fig. 5 is a sec'- tion on plane 5-5 of Fig. 4; Fig. 6 is a sectional detail of the partitions between the cylindrical drums; and Fig. 7 is a part sectional view of the discharge gate.

As illustrated inthe drawings, I, II, III are cylindrical drums, each formed of a series of spaced bars, preferablyschannel-bars, secured to cast-steel rings 2, 2, 2, and 3, 3, 3. As shown, there are three of such drums arranged in lseries on an incline, but a greater orless number may be used. Rings 2 are toothed on the periphery to form spur gears which mesh with pinions 4 mounted on shaft 5 through which shaft power is transmitted to rotate the drums. Rings 3 have smooth peripheries which form rails on which the' drumstravel supported by anged wheels 6. By having the wheels 6 flanged, endwise movement ofthe drums 1 is prevented. The flanged wheels 6 are suitably mounted in pairs'jon rocker arms 7. 'These rocker arms 7 rest on pedestals 8 which in turn rest upon I-beams 17', which extend transversely across a concrete base 9, and flush with the top thereof, which base extends beneath the entire device. By virtue of the curvature of rocker-arms 7 and the fact that they rest distance. By virtue of the spaces between the bars 10 the bark and dirt and water are speedily removed.

Referring to Figs. 4. and 5 it will be noted that between each channel-bar 10 and the steel ring 3 (a similar construction eX- ists between the channel bars and the rings 2) there is a steel cushioning plate 11 to which the rails 2 and 3 are riveted. This cushioning plate 11 takes u a great deal of the force of the blows of t e heavy logs of wood as they roll around Within the drum. Placed within the channels of the bars 10 are cast-iron blocks 12 having the same depth as the channels, and through these blocks 12 the end portions of each plate 11 are riveted to its ,channel-bar 10. The high end of drum I and of drum II, and both e ends of drum III, are provided with annular flanges or rings 13. These rings 13 prevent the bark which does not pass out through the slots, from moving longitudinally from drum to drum, but allows it to pass to the pit below through the spaces between the drums, which are made wide for that purpose.

When the wood reaches the lower drum, it is practically clean and it is therefore not necessary to provide an outlet for the bark at the lower end of this drum. The annu lar ring is placed on the lower end of the 'last drum of the series, .in order to take up the end-thrust of the wood, which would otherwise come onthe discharge gate.

Referring now to Figs. 3 and 7, there are, suitably mounted on the base 9 in front of the discharge opening of the drum-1, channeled guides 14 in which a number of T- bars 15'are placed in an inclined position as shown, with the flanges 16 facing away from the discharge opening of the drum, thus forming a discharge shield. The number and height of these bars 15 will of course determine' the-extent to which the discharge opening of the drum is closedv and thereby regulate the depth of wood retained within the drum.

Referring to Figs. 2 and 3, the base 9 is provided with a pit 17 which extends longitudinally beneath the drum. In this pit beneath the drum a scraper conveyer` 18 of any suitable form is mounted and supported by guides 19 (Fig. 3). Beneath the scraper 18 extends a perforated plate 20 which is adapted to catch the barkas itdrops between the spaces of the channel-bars of the drum but permits the water to flow through into'a passage 21, whence it flows off. The scraper 18 is adapted by its movement over the plate 20 to carry away the loose bark. The scraper conveyer may be operated by any suitable power means applied to the sprockets 22. A shower-pipe or spray 23 extends through but is not connected to the drum and serves to wash the bark out of thedrum immediately as soon as it has been loosened from the logs.

In operation, power is applied to the shaft and sprockets 22 to move the drums 1 and conveyer 18. Logs ofv wood of proper length, preferably in two or four foot. lengths7 are fed into the rst drum at the` upper end, whereupon they are rolled around and gradually moved from drum toV drum to the discharge end of the series of drums. The constant rubbing of the logs upon one another causes the removal of the bark which is immediately washed by the 65 water from spray 23 through the spaces bemaaar/a tween the channel-bars 10 and the spaces between the drums down onto the perforated plate 20, and is carried away by the scraper 18. The thoroughness with which the wood is cleaned depends upon the amount of wood in the drum; ordinarily the drum is about one third full but the discharge shield is made adjustable, so that a greater or less quantity of wood may be maintained. To further effect a proper and thorough removal of the bark, the partitions 13, above referred to, have been provided, which prevent any loose bark passing from one drum to another drum but still give the logs in their rolling motion a free passage. By thishmeans the bark is removed from thc drum-immediately it has been separated from the4 wood and is not carried lalong within thedrums, thereby keeping the wood perfectly clean. By arranging the channelbars 1() with their channels facing outwardly, an interior surface is presented which is practically smooth, and thereby the logs in rolling around are not gouged or chipped by any sharp surfaces which would injure them. f

The drums are mounted at such an angle of inclination that a substantially uniform depth of wood is maintainedr within the drum.

I claim 1. In a woodbarln'ng machine, a series of spaced rotatable drums having practically smooth slotted interior surfaces and forming a substantially continuous passage for 10p the wood, and bark restraining partitions between each of the drums.

2. In a wood barking machine, a series of rotatable drums each provided with apertures to permit continuous removal of the 10g. bark, bark restraining partitions between the,

drums, means for rotating said' drums, and

a shower pipe extending through said drums.

3. In a wood barking machine, a drum comprising a series of spaced bars extending longitudinally thereof and having their channels .facing outwardly, a plurality of rings encircling said drum, the periphery of one of said rings being toothed to form spur gear, a cushion plate between each channel bar and each ring, and riveted to said ring, a plurality of blocks in the channels of said bars beneath each of said plates and riveted to said plates and channel bars, and means for rotatingy said drum.

4. In a ,wood barking'ma'chine, a drum comprising a series of spaced bars extending longitudinally thereof, a plurality of rings encircling said drum, a cushion plate between each bar and each ring and secured to said ring, and blocks secured between each bar and plate. 4

5. In a wood-barking machine, a series of rotatable drums'each provided with apertures to permit continuous removal of the bark, a conveyer extending beneath said drums, a perforated plate beneath said conveyer, means for rotating said drums, and means for moving `said conveyor over said perforated plate.

6. In a wood-barking machine, an inclined hollow chamber consisting of a series of spaced rotatable drums having slotted sides and forming a substantially continuous passage for the wood, each drum having barkrestraining rings at the higher end thereof, and means for rotating said chamber. 7 In a wood-barking machine, an inclined hollow chamber consisting of a series of spaced rotatable drums having slotted sides and forming a substantially continuous passage for the wood, each drum having barkrestraining rings at the higher end thereof,

continuous removal of the bark, a shower 25 'pipe extending through said drums, and

means for rotating said drums. i

9. In a wood barking machine, a series of lspaced rotatable drums having a practically -smooth slotted interior surface to permit 30 continuousV removal of the bark, bark restraining partitions between the drums, a

shower pipe extending through said drums, and means for rotating said drums.

In testimony whereof I ailix my signature. 35

' vPETER A. PAULSON. 

